Jean M. Twenge

Social exclusion impairs self-regulation.

Six experiments showed that being excluded or rejected caused decrements in self-regulation. In Experiment 1, participants who were led to anticipate a lonely future life were less able to make themselves consume a healthy but bad-tasting beverage. In Experiment 2, some participants were told that no one else in their group wanted to work with them, and these participants later ate more cookies than other participants. In Experiment 3, excluded participants quit sooner on a frustrating task. In Experiments 4-6, exclusion led to impairment of attention regulation as measured with a dichotic listening task. Experiments 5 and 6 further showed that decrements in self-regulation can be eliminated by offering a cash incentive or increasing self-awareness. Thus, rejected people are capable of self-regulation but are normally disinclined to make the effort.

If You Can't Join Them, Beat Them: Effects of Social Exclusion on Aggressive Behavior

Social exclusion was manipulated by telling people that they would end up alone later in life or that other participants had rejected them. These manipulations caused participants to behave more aggressively. Excluded people issued a more negative job evaluation against someone who insulted them (Experiments 1 and 2). Excluded people also blasted a target with higher levels of aversive noise both when the target had insulted them (Experiment 4) and when the target was a neutral person and no interaction had occurred (Experiment 5). However, excluded people were not more aggressive toward someone who issued praise (Experiment 3). These responses were specific to social exclusion (as opposed to other misfortunes) and were not mediated by emotion.

Social exclusion decreases prosocial behavior.

In 7 experiments, the authors manipulated social exclusion by telling people that they would end up alone later in life or that other participants had rejected them. Social exclusion caused a substantial reduction in prosocial behavior. Socially excluded people donated less money to a student fund, were unwilling to volunteer for further lab experiments, were less helpful after a mishap, and cooperated less in a mixed-motive game with another student. The results did not vary by cost to the self or by recipient of the help, and results remained significant when the experimenter was unaware of condition. The effect was mediated by feelings of empathy for another person but was not mediated by mood, state self-esteem, belongingness, trust, control, or self-awareness. The implication is that rejection temporarily interferes with emotional responses, thereby impairing the capacity for empathic understanding of others, and as a result, any inclination to help or cooperate with them is undermined.

Egos inflating over time: a cross-temporal meta-analysis of the Narcissistic Personality Inventory.

A cross-temporal meta-analysis found that narcissism levels have risen over the generations in 85 samples of American college students who completed the 40-item forced-choice Narcissistic Personality Inventory (NPI) between 1979 and 2006 (total n=16,475). Mean narcissism scores were significantly correlated with year of data collection when weighted by sample size (beta=.53, p<.001). Since 1982, NPI scores have increased 0.33 standard deviation. Thus, almost two-thirds of recent college students are above the mean 1979-1985 narcissism score, a 30% increase. The results complement previous studies finding increases in other individualistic traits such as assertiveness, agency, self-esteem, and extraversion.

Generational Differences in Work Values: Leisure and Extrinsic Values Increasing, Social and Intrinsic Values Decreasing:

Organizations are currently facing the retirement of many older workers and the challenge of recruiting and retaining young talent. However, few studies have empirically substantiated generational differences in work values. This study examines the work values of a nationally representative sample of U.S. high school seniors in 1976, 1991, and 2006 (N = 16,507) representing Baby Boomers, Generation X (GenX), and Generation Me (GenMe, also known as GenY, or Millennials). With data collected across time, these analyses isolate generational differences from age differences, unlike one-time studies, which cannot separate the two. Leisure values increased steadily over the generations (d comparing Boomers and GenMe = .57), and work centrality declined. Extrinsic values (e.g., status, money) peaked with GenX but were still higher among GenMe than among Boomers (d = .26). Contrary to popular press reports, GenMe does not favor altruistic work values (e.g., helping, societal worth) more than previous generations. Social values (e.g., making friends) and intrinsic values (e.g., an interesting, results-oriented job) were rated lower by GenMe than by Boomers. These findings have practical implications for the recruitment and management of the emerging workforce.

Changes in masculine and feminine traits over time : A meta-analysis

Sixty-three samples providing single-sex means on the Bem Sex-Role Inventory [BSRI; S. L. Bem (1974) “The Measurement of Psychological Androgyny,”Journal of Consulting and Clinical Psychology, Vol. 42, pp. 155–162] and 40 reporting similar data on the Personal Attributes Questionnaire [PAQ; J. T. Spence and R. L. Helmreich (1978)Masculinity and Feminity, Austin University of Texas Press] for American undergraduates were located and analyzed. Women’s scores on the BSRI-M and PAQ-M (masculine) scales have increased steadily over time (r’s = .74 and .43, respectively). Women’s BSRI-F and PAQ-F (feminine) scale scores do not correlate with year. Men’s BSRI-M scores show a weaker positive relationship with year of administration (r = .47). The effect size for sex differences on the BSRI-M has also changed over time, showing a significant decrease over the twenty-year period. The results suggest that cultural change and environment may affect individual personalities; these changes in BSRI and PAQ means demonstrate women’s increased endorsement of masculine-stereotyped traits and men’s continued nonendorsement of feminine-steretyped traits.

“Isn’t It Fun to Get the Respect That We’re Going to Deserve?” Narcissism, Social Rejection, and Aggression

Across four studies, narcissists were more angry and aggressive after experiencing a social rejection than were nonnarcissists. In Study 1, narcissism was positively correlated with feelings of anger and negatively correlated with more internalized negative emotions in a self-reported, past episode of social rejection. Study 2 replicated this effect for a concurrent lab manipulation of social rejection. In Study 3, narcissists aggressed more against someone who rejected them (i.e., direct aggression). In Study 4, narcissists were also more aggressive toward an innocent third party after experiencing social rejection (i.e., displaced aggression). Narcissists were not more aggressive after social acceptance. Self-esteem plays little role in predicting aggression in response to rejection. These results suggest that the combination of narcissism and social rejection is a powerful predictor of aggressive behavior.

Individual differences in narcissism: Inflated self-views across the lifespan and around the world

Abstract The present investigation examined associations among narcissism, age, ethnicity, world region, and gender, using a large ( n =3445) sample of participants representing several different world regions and ethnicities. The results suggest that (1) reported narcissism declines in older participants, (2) consistent with previous findings, males report being more narcissistic than females, (3) that ethnic differences in reported narcissism are generally comparable to those found in the self-esteem literature, and (4) that world region appears to exert influence on narcissism, with participants from more individualistic societies reporting more narcissism. The results are discussed in terms of how age and culture might impact narcissism and how future research might address this topic.

Attitudes Toward Women, 1970-1995: A Meta-Analysis

The social climate for women has changed considerably since the Attitudes Toward Women Scale (AWS; Spence & Helmreich, 1972a) was developed in the early 1970s, but the pattern of change in AWS scores throughout the 1970s, 1980s, and 1990s is unclear. Published reports of data from 71 samples of American undergraduates responding to the AWS were located and analyzed for differences across time (1970–1995) and region (South and non-South). Womens AWS scores were strongly correlated with year of scale administration (r = .78, p < .001), and mens scores showed a similar trend toward more liberal/feminist attitudes (r = .60, p < .001). Scores show a steady trend toward more liberal/feminist attitudes, with no appreciable reversal or slowdown during the 1980s. Gender differences steadily increased from 1970 to 1985 and decreased from 1986 to 1995. Southern samples were marginally more conservative/traditional. The results are discussed in terms of generational differences, the effects of maternal employment on attitudes, and the individuals experience of cultural change.

Social exclusion causes self-defeating behavior

Four experiments tested the idea that social exclusion leads to (unintentionally) self-defeating behavior. Exclusion was manipulated by telling some people that they were likely to end up alone later in life. This randomly assigned feedback caused people to take irrational, self-defeating risks (Experiments 1 and 2), choose unhealthy, rather than healthy, behaviors (Experiment 3), and procrastinate longer with pleasurable activities rather than practicing for an upcoming test (Experiment 4). A control group, who heard that their future would be marred by frequent accidents, did not show these self-defeating patterns. Thus, the effect goes beyond just hearing bad news. Emotional distress did not significantly mediate these effects across 3 different mood measures.